/Engine/Source/Runtime/Engine/Classes/Engine/SkeletalMesh.h
Clothing used to require the original section to be hidden and duplicated to a new rendered section. This was mainly due to an older requirement that we use new render data so the duplicated section allowed us not to destroy the original data. This method will undo this process and restore the mesh now that this is no longer necessary.
void RemoveLegacyClothingSections()